Deny connecting to a port through a proxy?

Question

iptables

Hello!
There is a game port 25565, is it possible (using iptables) to prohibit connecting to the game using fake proxy IP addresses?

Answer 1

There is practically no such possibility.
For starters, game clients are rarely proxied (unless it's http)
. Secondly, most nat players will look like proxied ports, and that's the vast majority of users.
Thirdly, you can give a definition of "fake proxy address"